JPH057777Y2 - - Google Patents

Description

[Detailed explanation of the idea] <Industrial application field> This idea relates to RDS radio.

<Conventional technology> In RDS (Radio Data System) broadcasting, a list of stations transmitting the same program as the station currently being received is sent from the station currently being received, and this is usually stored in memory. are doing. The list stored in this memory is called the AF list.
At the same time, a confirmation code called a PI code is also sent to confirm the identity of the program.
If it is the same program, the same PI code is transmitted.

If the field strength of the receiving station decreases, the corresponding
Scan all stations listed in the AF list,
The station is arranged in order of strength of electric field, checks the PI codes in descending order of strength, and switches the receiving station if the electric field strength is stronger than the original receiving station and the PI codes match. There is.

<Problems with the Prior Art> However, the conventional configuration described above has a drawback in that a large memory capacity is required in order to arrange all the stations in the AF list in order of electric field strength.

<Summary of the invention> The present invention was made to improve the drawbacks of the conventional configuration described above. a first determining means for sequentially checking electric field strength and determining whether the electric field strength exceeds a predetermined level; a means for storing a plurality of stations whose received electric field strength is equal to or higher than a predetermined level in descending order of electric field strength; and a second determining means for determining whether the PI code of the station corresponds to the PI code of the receiving station in descending order of received field strength, and based on the second determining means,
The basic feature is that when it is determined that the PI codes are the same, the receiver immediately switches to reception of the station that is the stored station and has the same PI code. This configuration makes it possible to switch to the station with the highest electric field strength in the AF list with a small memory capacity.

<Example> An example of the present invention will be described below based on the drawings.

Figure 1 shows an embodiment in which the present invention is realized using a microcomputer, and the RDS broadcast received by tuner 1 via the antenna is
The data is decoded by the decoder 2 and input to the microcomputer 3 as RDS data. As mentioned above, this RDS data includes the AF list, PI
Code included.

The tuner 1 also transmits an S meter (signal meter) output indicating the electric field strength of the broadcast being received to the microcomputer 3 via the A/D converter 4. Note that 5 is a low-pass filter. Further, although only one tuner 1 is used in this embodiment, two tuners may be provided in order to prevent the audio from being interrupted during the tracking operation.

The microcomputer 3 uses the digitized S meter output from the A/D converter 4 to constantly check whether the field strength level of the broadcast being received is below a predetermined value. Then, when the received electric field strength falls below a predetermined value, tuner 1 is controlled.
Each station in the AF list is received in turn, the S meter output is received, and the electric field strength of each station in the AF list is checked. If the electric field strength level is equal to or higher than a predetermined level, the frequencies of each station are stored in the internal memory 30 in descending order of electric field strength. The memory 30 only needs to have a capacity to store the frequencies of a predetermined number of stations, and normally it is sufficient to have a capacity to store the frequencies of two or three stations. Since stations in the AF list should originally be transmitting the same broadcast,
It would be fine to memorize one game, but in this invention,
I am trying to store multiple stations just in case the PI code is different. Now memory 3
Assume that the storage capacity of 0 is for two stations, and that stations A to G are listed in the AF list as shown in FIG. It is assumed that each station has an electric field strength as shown in the graph. When the electric field strength of the broadcast currently being received falls below the reference level, the microcomputer 3 checks the electric field strength in order from station A, and stores the frequencies of the stations whose electric field strength is equal to or higher than the reference level in the memory 30 in order of increasing field strength. To go. That is, since the electric field strength of station A is above the reference level, microcomputer 3 first stores the frequency of station A in memory 30. Next, since the electric field strength of station B is also above the reference level, the frequency of station B is also stored in the memory 30. Next, station C is discarded because it is below the standard level. Since the field strength of station D is above the reference level and larger than stations A and B, the frequency of station A is overflowed and the frequency of station D is stored instead, and the frequency of station BD is stored in the memory 30. be remembered. Then, according to the same procedure, the stations stored in the memory 30 change from BD to DF, and finally, the frequencies of the two stations D and F having the highest electric field strength are stored in the memory 30.

Next, the microcomputer 3 examines the PI codes of the stations stored in the memory 30 in order of strength of the electric field, and checks whether this PI code matches the PI code of the station currently being received. If they match, the receiving station is switched to that station by controlling tuner 1 (or another tuner). If they do not match, check the PI code of the next station and switch the receiving station to the matching station. If the PI codes of all stations stored in the memory 30 do not match, reception of the original station is continued.

Next, the operation of the microcomputer 3 will be explained in more detail based on the flowchart shown in FIG.

First, it is constantly checked whether the received field strength foe of the receiving station fo is below the reference level (step 50). When it falls below the reference level, move to station fn in the AF list and check the electric field strength fne of each station in sequence (steps 51 and 52). If the field strength fne of the station has reached the reference level, the frequencies of the stations are stored in the memory 30 in descending order of field strength, and this is executed for all stations in the AF list (step 53,
54). Since the capacity of the memory 30 is limited to a predetermined number, the frequencies of a predetermined number of stations are finally stored in the memory 30 in descending order of electric field strength.

Then, the PI codes of the stations stored in the memory 30 are checked in descending order of electric field strength (step 55), and if they match the original receiving station, the receiving station is switched to that station and this is set as fo (step 56). 57). After that, it is checked whether the switch of the device is turned off (step 59), and if it is not turned off, the process returns to step 50 and repeats the same operation. If the PI codes do not match in step 56, the next station is checked in sequence (step 58), and if the PI codes do not match for all the stations in the memory 30, the process returns to step 50 via step 59.
Receive the original station.

As explained above, according to the above mechanism, the frequencies are stored in the limited capacity memory in descending order of electric field strength, so there is no need to rank all the electric field strengths of stations in the AF list in ascending order. It does not require a large amount of memory. Moreover, since multiple stations are stored in the storage unit in descending order of electric field strength, there is no need to repeat the sweep even if the PI codes do not match, and the PI code of the station with the next highest electric field strength is It is extremely efficient because it can determine a match.

<Effects of the invention> As explained above, when the received field strength of the station being received becomes lower than a predetermined level, the RDS method radio of the present invention sequentially checks the received field strength of the stations in the AF list and detects the corresponding station. a first determining means for determining whether the electric field strength exceeds a predetermined level; a means for storing a plurality of stations whose received electric field strength is at least a predetermined level in descending order of electric field strength; and a PI code of the stored station and the receiving station. a second determination means for determining the match with the PI code of the station in descending order of received field strength;
If the PI codes are determined to be the same based on the second determination means, immediately the stored station and
Since the PI code has means for switching to reception of the same station, it is possible to accurately follow a receiving station broadcasting the same program without requiring a large capacity memory. In addition, since multiple stations are stored in the storage unit in order of electric field strength, even if the PI codes of one station do not match, there is no need to repeat the sweep, and the next station with the highest electric field strength is It has the advantage of being extremely efficient because it can determine if the PI codes match.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is an explanatory diagram of the operation, and FIG. 3 is a flowchart. 1...Tuner, 2...RDS decoder, 3...
...Microcomputer, 4...A/D converter,
5...Low pass filter, 30...Memory.

Claims (1)

[Claim for Utility Model Registration] When the received field strength of the station being received becomes smaller than a predetermined level, the received field strength of the stations in the AF list is sequentially checked to determine whether the field strength exceeds the predetermined level. means for storing a plurality of stations whose received electric field strength is equal to or higher than a predetermined level in descending order of electric field strength;
a second determining means that determines whether the PI code matches the received electric field strength in descending order of received field strength; and if the PI codes are determined to be the same based on the second determining means, immediately the stored station and the PI code are An RDS radio, comprising means for switching to reception of the same station.